Add commonmarker gem

It resolves following warning in tests: ``` cannot load such file -- commonmarker: skipping markdown tests with Tilt::CommonMarkerTemplate ```
2019-04-28 18:02:45 +02:00 · 2019-04-28 18:02:45 +02:00 · c0dd32ec19
parent 1d19193653
commit c0dd32ec19
1 changed files with 1 additions and 0 deletions
--- a/1
+++ b/1
@ -59,6 +59,7 @@ if RUBY_ENGINE == "ruby"
  gem 'sass'
  gem 'reel-rack'
  gem 'celluloid', '~> 0.16.0'
+  gem 'commonmarker', '~> 0.20.0'
  gem 'simplecov', require: false
 end